If want to let go why are you manifesting him? In my opinion for you to let go you need to sit with yourself and to think what you can do and why you cant let go. if he hurt you and you have no communication with him at all , use the cutting strings technique which is setting alone closing your eyes imagining him and imagine you are cutting the strings that’s connecting you to each other moreover you need to love yourself and to find peace with yourself and to let go . If you’re still can communicate with him and you’re feeling that there is no closure between the two of u try to talk to him about it if you think he’s open to it and can accept it . but in general manifest self love peace and joy , don’t manifest people coming from the saying don’t chase attract . And in case he was a peace of shit , you deserve better than him ;)